Computer Aided Preform Design for Long Hot Forgings

Long forgings are made from bar stock and normally require several preforming stages, the number employed being governed by the process technology and economic considerations of the quantities required. If the cross sectional area of the component varies appreciably along its length, material must be distributed along the length of the stock by drawing down the bar at various points. For hammer dies this is achieved by fuller and roller dies. Subsequently a further preforming stage (moulding impression) may be used, the purpose of which is to distribute material in the individual cross sections, to more closely approach the cross sections of the final part.